Spin-Dependent Charge Transport through 2D Chiral Hybrid Perovskite Layers
Dec. 6, 2019
Here we demonstrate how to integrate an oriented chiral organic sublattice into an inorganic framework, creating a semiconducting chiral system that can transport electrons with the desired spin control.
Scientific Achievement
We developed oriented 2D layered Pb-Iodide perovskite films with chiral organic molecules. The films achieve ~90% spin-polarized transport. Such that for "right"-handed molecules electrons with 'up'-spins transmit and 'down' –spins are blocked.
Significance and Impact
Controlling and manipulating spin-populations represents a different way to build electronic-devices. Chiral-induced spin selectivity (CISS) has been observed in monolayers of chiral organic molecules. Our approach allows for self-assembled stacks of chiral organic molecules to be the spin-filters. Much larger polarization factors can be achieved as well as larger form factors.
Research Details
- Prepare 2D Pb-I perovskite thin films based on R, and S- methylammonium benzene (R,S-MBA)
- Spin filter effect was measured using conductivity force magnetic AFM (atomic force microscopy). Spin-valves with just one ferromagnet were fabricated.
Related People
Joseph Berry
National Renewable Energy Laboratory
Kai Zhu
National Renewable Energy Laboratory
Matthew Beard
National Renewable Energy Laboratory
Zeev Valy Vardeny
University of Utah
Magnetic force ARM measurements demonstrate the spin-filtering effect. When R or S chiral ligands are used there is a preference for spin-polarized current transfer.
Chiral 2D Pb-I perovskite (n=1) contain oriented chiral molecules that self assemble into the layers between the PbI4 octahedron. The R or S- versions can be incorporated and imbue optical activity to the inorganic sublattice (right)
